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      1 /*
      2  * Copyright 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_JAUDIOATTRIBUTES_H
     18 #define ANDROID_JAUDIOATTRIBUTES_H
     19 
     20 #include <jni.h>
     21 #include <system/audio.h>
     22 
     23 namespace android {
     24 
     25 class JAudioAttributes {
     26 public:
     27     /* Creates a Java AudioAttributes object. */
     28     static jobject createAudioAttributesObj(JNIEnv *env,
     29                                             const audio_attributes_t* pAttributes,
     30                                             audio_stream_type_t streamType) {
     31 
     32         jclass jBuilderCls = env->FindClass("android/media/AudioAttributes$Builder");
     33         jmethodID jBuilderCtor = env->GetMethodID(jBuilderCls, "<init>", "()V");
     34         jobject jBuilderObj = env->NewObject(jBuilderCls, jBuilderCtor);
     35 
     36         if (pAttributes != NULL) {
     37             // If pAttributes is not null, streamType is ignored.
     38             jmethodID jSetUsage = env->GetMethodID(
     39                     jBuilderCls, "setUsage", "(I)Landroid/media/AudioAttributes$Builder;");
     40             jBuilderObj = env->CallObjectMethod(jBuilderObj, jSetUsage, pAttributes->usage);
     41 
     42             jmethodID jSetContentType = env->GetMethodID(jBuilderCls, "setContentType",
     43                     "(I)Landroid/media/AudioAttributes$Builder;");
     44             jBuilderObj = env->CallObjectMethod(jBuilderObj, jSetContentType,
     45                     pAttributes->content_type);
     46 
     47             // TODO: Java AudioAttributes.Builder.setCapturePreset() is systemApi and hidden.
     48             // Can we use this method?
     49 //            jmethodID jSetCapturePreset = env->GetMethodID(jBuilderCls, "setCapturePreset",
     50 //                    "(I)Landroid/media/AudioAttributes$Builder;");
     51 //            jBuilderObj = env->CallObjectMethod(jBuilderObj, jSetCapturePreset,
     52 //                    pAttributes->source);
     53 
     54             jmethodID jSetFlags = env->GetMethodID(jBuilderCls, "setFlags",
     55                     "(I)Landroid/media/AudioAttributes$Builder;");
     56             jBuilderObj = env->CallObjectMethod(jBuilderObj, jSetFlags, pAttributes->flags);
     57 
     58             // TODO: Handle the 'tags' (char[] to HashSet<String>).
     59             // How to parse the char[]? Is there any example of it?
     60             // Also, the addTags() method is hidden.
     61         } else {
     62             // Call AudioAttributes.Builder.setLegacyStreamType().build()
     63             jmethodID jSetLegacyStreamType = env->GetMethodID(jBuilderCls, "setLegacyStreamType",
     64                     "(I)Landroid/media/AudioAttributes$Builder;");
     65             jBuilderObj = env->CallObjectMethod(jBuilderObj, jSetLegacyStreamType, streamType);
     66         }
     67 
     68         jmethodID jBuild = env->GetMethodID(jBuilderCls, "build",
     69                 "()Landroid/media/AudioAttributes;");
     70         return env->CallObjectMethod(jBuilderObj, jBuild);
     71     }
     72 
     73 };
     74 
     75 } // namespace android
     76 
     77 #endif // ANDROID_JAUDIOATTRIBUTES_H
     78